Furnace



2 SheetsSheet 1.

(No Model.)

A. J. HILL.

FURNACE.

No. 388,360. Patented Aug. 21, 1888.

2 Sheets-Sheet 2. A. J. HILL.

FURNACE (No Model.)

No. 388,360. Patented Aug. 21, 1888.

UNITED STATES PATENT Qrrrcn ALEXANDER J. HILL, OF ROCKFORD, ILLINOIS.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 388,360, dated August21, 1888.

Serial No. 247,539. (No model.)

To all whom it may concern:

Be it known that I, ALEXANDER J. HILL, a citizen of the United States,residing in the city of Rockford, county of \Vinnebago, and Stateoflllinois,have invented certain new and useful Improvements inFurnaces,of which the following is a specification.

This invention relates to a class of furnaces known as the hotairfurnace, employed for heating purposes.

The object of this invention is to improve this class of furnaces torender them more efficient.

It is a well-settled axiom in my mind that a furnace limited in itscapacity to the delivery of a small volume of air highly heated is notas efficient as a heater as a furnace capable of delivering a largerVolume of air containing the same amount of heat. \Vith this axiom inview I have designed and constructed the furnace represented in theaccompanying drawings, in which Figure 1 is a vertical central sectionin isometrical of a furnace embodying my invention. Fig. 2 is atransverse section through the hot-air flues and through theoutlet-smoke flue. Fig. 3 is a transverse section through the cold-airinduction-pipes.

In the figures the base 1 of the furnace is cylindrical in plan, withash-pit 2 rising from its central portion and extending on one side toits periphery, and outside of the ash-pit it is made in the open formshown to admit air to the heating-chamber.

A fire-pot, 12,is supported at its lower edge on the upper edge of thewalls of the ash-pit.

The heating portion of the furnace above the fire-pot consists, first,of a section composed of an outer cylinder, 13, aninner cylinder, 14,with closed lower end, and airtubes 15, opening through the wall of theouter cylinder and opening into the chamber of the inner cylinder, (thisfirst section is supported on the upper edge of the fire pot;) second,of an upper cylindrical section,16, supported on the upper edge ofsection 13; and, third, of an inverted-bell-shaped inner section,17,having its lower endsupported on the upper edge of the innercylinder, l4,and its upper end resting on the upper edge of the secondsection I 16, and forms a fire-chamber, 18, between the outer and innercylinders.

Radial smokeflues 19 connect the fire-chamber 18, and a smoke-flue, 20,suspended in the dome centrally in the upper end of the innerbell-shaped cylinder is supported in position of the radial smoke-fines19, fixed in the walls on the respective parts.

Ajacket, 21, of plate material, serves to inclose the furnaee,and itsfoot end is supported on its base 1, and forms an aiuehamber, 22,between the jacket and furnace.

Doors 23 and 24 open through the jacket into the ash-pit and into thefire-pot, in the usual manner.

Air-tubes 25 open through the base of the furnace and rise within theair-chamber 22 and connect with the radial tubes 15 to conduct externalair into the lower end of central bell-formed cylinder. By admitting theair to the chamber 14 at a point at the base of the furnace and leadingit thence upwardly along the side of the fire-pot, as shown by the tubes25, a strong current of air is induced because of the increasedtemperature of the same as it gradually approaches the hotter portion ofthe fire-pot.

Tubes 26 connect the jacket with the second cylindrical section, 16, inline with the smokefiucs 19, for the purpose of cleaning the smokeflues,and these tubes 26 are provided with a removable cap or door, 27, toclose their external openings. Hot-air tubes 28 connect with the upperend or dome portion of the jacket to conduct the heated air of thefurnace to deliver it at the points required.

In the use of my improved furnace fire is made upon the grate, and airto support combustion is admitted to the ash-pit under the fire-gratethrough the door 23, or through a register therein, and the gasesgenerated by the combustion of the fuel will rise through thefire-chamber 18 and through the gas-fines 19, as indicated by thearrows.

External air to be heated will be admitted 5 the air-tubes and enterthelowerend of the inner chamber within the walls oftheinvertedbell-formed cylinder, composed of sections 14 and 17, asindicated by the arrows, and in contact with the heated surface of itsinner walls will rise into the dome to mingle with the heated air of thechamber 22,to be distributed through the hot-air tubes 28. I11 thisconstruction of furnace the air is subjected to a largearea ofheating-surface by which a large volume of air is rapidly heated fordistribution.

The specific construction of the grateherein set forth forms no part ofmy present invention, but is reserved as subject-matter of anotherapplication to be hereafter filed.

I claim as my invention 1. In a hot-air furnace, the combination of anouter air-chamber, an inner air-chamber centrally over the firepot,air-flues connecting the outer and inner chambers, afire'eliamberbetween the air-chambers, a smoke-flue centrally in the dome, and radialgas flues connecting the fire chamber and central smoke-flue,substantially as and for the purpose set forth.

2. In a hot-air furnace, the combination of an outer air-chamber, aninner air-chamber, furnace-chamber between the inner and outerair-chambers, a smoke-flue centrally in the dome, radial smoke-finesconnecting the furmace-chamber and central smoke flue, and radial tubesconnecting the jacket and outer wall of the furnace in line vwith thesmokeflues connecting the furnace-chamber and central smoke-flue,substantially as and for the purpose set forth. a

3. In a hot-air furnace, the combination of an outer air-chamber andinner air-chamber centrally over the fire-pot, air-flues connecting theouter and inner chambers, the said connecting-fiues extending throughthe fireohamber and downwardly along the side of the fire-pot toward thebase of the furnace, substantially as set forth.

4. In a hot-air furnace, the combination of an outer air-chamber, aninner air-chamber centrally over the fire-pot, air-flues connecting theouter and inner chambers, said outer and inner chambers meeting in thedome, and a fire-chamber between the said air chambers, the saidfire-chamber being formed by an outer wall-section resting on the top ofthe fire-pot, an inner wall-section supported centrally over thefire-pot, an upper outer wall-section resting on the top of thefirst-named outer wallsection, and an inner upper wall-section restingon the top of the said inner wall-section and on the top of the saidupper outer wallseetion, substantially as set forth.

ALEXANDER J. HILL.

Witnesses:

J AOOB BEHEL, A. O. BEHEL.

